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238 changes: 238 additions & 0 deletions .clang-format
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# DO NOT EDIT
# USE https://clang-format-configurator.site/
# Use version 17.0.6

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4 changes: 4 additions & 0 deletions .gitignore
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bin/
obj/
checks.json
gmon.out
24 changes: 13 additions & 11 deletions README.md
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Expand Up @@ -17,47 +17,49 @@ This software is based on C program and requires gcc to compile the program from
cd sainsmart-usb-relay
make
sudo make install

The "make install" command copies the binary to /usr/local/bin. So the command can be utilized anywhere from the system.

- The following works for both a Raspberry Pi (Debian Wheezy) and Ubuntu 16.04, getting ordinary users (e.g. ‘pi’ on the RPi) access to the FTDI device without needing root permissions:

Create a file /etc/udev/rules.d/99-libftdi.rules. You will need sudo access to create this file.
Create a file /etc/udev/rules.d/53-libftdi.rules. You will need sudo access to create this file.
Put the following in the file:

SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", GROUP="dialout", MODE="0660"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6014", GROUP="dialout", MODE="0660"
Some FTDI devices may use other USB PIDs. You could try removing the match on idProduct altogether, just matching on the FTDI vendor ID. Or Use lsusb or similar to determine the exact values to use (or try checking dmesg output on device insertion / removal).


See `udev/53-ftdi.rules` for example

Usage
============
This project provides a simple command to interact with the USB relay.

To turn on the USB relay

sudo sainsmart --on RELAY_NUMBER
sudo sainsmartrelay --on RELAY_NUMBER

For example to turn on the relay 1 we can use

sudo sainsmart --on 1
sudo sainsmartrelay --on 1
To run on all the relays

sudo sainsmart --on all
sudo sainsmartrelay --on all

To turn off the USB relay 1

sudo sainsmart --off 1
sudo sainsmartrelay --off 1
To run on all the relays

sudo sainsmart --off all
sudo sainsmartrelay --off all

To get the status of the relays

sudo sainsmart --status
sudo sainsmartrelay --status

To get more help information

sudo sainsmart --help
sudo sainsmartrelay --help

Notes
============
Expand All @@ -67,4 +69,4 @@ The Sainsmart card uses the FTDI FT245RL chip. This chip is controlled directly
To prevent automatic loading of the driver, add the following line to /etc/modprobe.d/blacklist.conf:

blacklist ftdi_sio
Both 4 and 8 channel versions are supported. However, there seems to be no way to automatically detect which version of the card is used. Therefore the number of relay channles can be configured in the configuration file.
Both 4 and 8 channel versions are supported. However, there seems to be no way to automatically detect which version of the card is used. Therefore the number of relay channles can be configured in the configuration file.
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